CSS Custom Properties (Variables)
Introduction
CSS Variables allow authors to create reusable values which can be used throughout a CSS document.
For example, it's common in CSS to reuse a single color throughout a document. Prior to CSS Variables this would mean reusing the same color value many times throughout a document. With CSS Variables the color value can be assigned to a variable and referenced in multiple places. This makes changing values easier and is more semantic than using traditional CSS values.
Syntax
- :root {} /* pseudo-class that allows for more global definition of variables */
- --variable-name: value; /* define variable */
- var(--variable-name, default-value) /* use defined variable with default value fallback */
Remarks
CSS Variables are currently considered an experimental technology.
BROWSER SUPPORT / COMPATIBILITY
Firefox: Version 31+ (Enabled by default)
Chrome: Version 49+ (Enabled by default).
"This feature can be enabled in Chrome Version 48 for testing by enabling the experimental Web Platform feature. Enter chrome://flags/ in your Chrome address bar to access this setting."
IE: Not Supported.
Edge: Under Development
Safari: Version 9.1+
